PASSIVITY BEHAVIOR OF SOME TI-MO ALLOYS

A study has been made of the electrochemical behaviour of titanium and various titanium - molybdenum alloys containing 15 to 32 wt % molybde num in 10 wt % oxalic acid, 30 wt % AlCl3.6H(2)O, 40 wt % LiCl solutio ns, both at ambient and at 50 degrees and 75 degrees C temperature. Po tentiodynamic measurements were carried out to establish the effect of molybdenum. In 10 wt % oxalic acid solution, the corrosion potentials of Ti-Mo alloys increase monotonically with Mo content; also, the cri tical passivation current density decreases and passivation current de nsity increases with increasing Mo content. In chloride containing sol utions there was observed no effect of molybdenum content in the alloy s on the corrosion potential and an improvement of the passivity behav iour. It is suggested that the interaction of molybdenum with the spec ific aggresive anions should be taken into account in the explanation of its effect.